NEET MDS Shorts
72434
Dental Anatomy
Well over 50% of maxillary 1st molars have two canals in the mesiobuccal root. Some authors cite the number as high as 90%. There are usually 3 roots and 4 canals in a maxillary 1st molar.
The fourth canal, the mesiolingual canal, is also referred to as: the accessory mesiobuccal canal, mesiocentric, mesiopalatal canal or MB2.
It is usually tough to find MB2 through clinical inspection and it is not obvious on a radiograph. A dentist should expect it is present before beginning a root canal on the first maxillary molar.
60335
Dental Anatomy
Sometimes, mineralization of dentin begins in small globular areas that fail to coalesce into a homogenous mass. This results in zones of hypomineralization between the globules.
These zones are known as globular dentin or interglobular spaces. Thus, demonstrating defect of mineralization and not of matrix formation, the dentinal tubules pass uninterruptedly through interglobular dentin.
84261
Dental Anatomymadibular first molar normally have 3 root canals
62072
Dental AnatomyThe beginning of active eruption of a human tooth occurs after one half of the root is formed
73875
Dental AnatomyThe most constant and valuable trait to differentiate among maxillary first second and third molars is the depth of central fossae
33766
Dental AnatomyIn an average child the mixed dentition period is from 6 yrs to 13 y
20757
Dental AnatomyA permanent tooth erupting in the mouth of an 11 years old child is most likely mandibular second bicuspid
54248
Dental Anatomy
Dentinogenesis is the formation of dentin by odontoblasts of mesenchymal origin
located at the periphery of the dental pulp
Dentinogenesis is initiated by the inductive influence of the enamel organ
involving molecular signaling pathways, such as Wnt, Runx-2, and TGF-?. In the
molar tooth, dentinogenesis starts at the late bell stage, and occurs in the
crown as well as root regions.
Predentin, the first organic matrix secreted by odontoblasts, is composed by
proteoglycans, glycoproteins, and collagens.
60063
Dental AnatomyIn the case of primary teeth, the roots are often resorbed as the permanent teeth develop. The facial aspect of the root tends to be the last area to undergo resorption due to its position and the way the succedaneous tooth exerts pressure. The facial root surface is generally more stable and remains attached to the gingiva longer than the other aspects, making it the longest and most securely attached during extraction.
44156
Dental AnatomyA mandibular primate space is usually found in the primary dentition between canine and first molar